Vulnerability · Published Aug 28, 2026 · Assigned by GitHub_M
CVE-2026-55834Pocket ID: Open Redirect on the OIDC /authorize page via unvalidated redirect_uri with prompt=none
Medium 4.3
In plain English
A medium-severity open redirect in pocket-id from pocket-id. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 31% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Pocket ID is an OIDC provider that allows users to authenticate with their passkeys to services. From 2.6.0 until 2.9.0, frontend/src/routes/authorize/+page.ts reads the redirect_uri query parameter and frontend/src/routes/authorize/+page.svelte uses the raw callbackURL in redirectWithError when prompt=none cannot complete silent authorization. The client-side path only blocks javascript and data schemes and does not invoke the backend callback allow-list validation, so an unauthenticated attacker who knows a valid client_id can redirect a victim browser to an arbitrary HTTP or HTTPS origin for phishing or OIDC error and state smuggling. This issue is fixed in version 2.9.0.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/pocket-id/pocket-id/backend | 2.9.0 | GHSA-2wvm-8mvp-22qv |
| Go | github.com/pocket-id/pocket-id/backend | no fix listed | GO-2026-6305 |
Affected products (as reported)
Weakness: CWE-601 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N